MFJ Enterprises Original MFJ-910 Mobile Antenna Matcher 10-80 Meters Mobile Matchbox Extends SWR Tuning Range Of HF Amateur and CB Antennas. 6 Selectable Settings for Getting Best Antenna SWR. Handles Up to 200W P.E.P SSB Power SO-239 in/out Accepts Cables With PL-259 Connectors. Great for Hamsticks, Mobile Antennas, Dipoles and More!